[Bizzers] Mate, you can't. If you can't work with the line provided, step back and let someone else do it. Ironic really, given that this Lim is all about 'you could have done better' innit?
[Bismarck] Your replacement line doesn't really follow the previous one smoothly in my reading of it, providing a mental derailment when the whole limerick is read through. Good finish though.
There's no CHOICE to make BUT live and LEARN said the DIScouraged AUTHor jules VERNE. Where's the problem? Nine syllables each line. Stress on each third syllable. Job done.